In Pakistan’s Swat valley, the aftermath of a violent Taliban invasion and army counter-offensive was interrupted by even more destructive devastation from this summer’s massive floods. Tomas van Houtryve’s haunting video and photo slideshow documents the valley’s efforts to find refuge while still stockpiling weaponry and ammunition.

The federal government is warning residents in a small Wyoming town with extensive natural gas development not to drink their water, and to use fans and ventilation when showering or washing clothes in order to avoid the risk of an explosion.

An influential climate scientist who has been accused by the Virginia attorney general of defrauding the public calls the probe “criminal harassment” and warns that the case could set a “horrifying” precedent.

Need to Know is a production of Creative News Group (CNG) in association with WNET. Marc Rosenwasser is Executive Producer. Need to Know is made possible by Bernard and Irene Schwartz, Mutual of America, Citi Foundation, John D. and Catherine T. MacArthur Foundation, Miriam and Ira D. Wallach Foundation, Margaret A. Cargill Foundation, The Corporation for Public Broadcasting and PBS.